CLX Equivalents of WMNCHitTest etc etc

Hi,

Can anyone tell me if there's any equivalents of many of the WM_~ message
handlers in the CLX library. I'm going to want to port ome code soon and
will have many
WM_NCHITTEST
WM_MOUSE....messages
and WM_SIZE mesages

to fix. I this a trivial problem?

JB